Neutrino experiments have been rewarded by the Nobel Prize in Physics four times, including the one for 2015. I will give an overview of how these experiments help us understand neutrinos, their production and interaction, and their flavor oscillations. The quantum mechanics of neutrino oscillations in both vacuum and matter will be discussed in analogy to precession of magnetic moments in magnetic fields. The important roles of neutrinos in a wide range of astrophysical phenomena will be described. I will conclude with a list of remaining puzzles about neutrinos.